SNOSAZ6C August   2008  – November 2015 LMV831 , LMV832 , LMV834

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics, 3.3 V
    6. 6.6 Electrical Characteristics, 5 V
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Characteristics
      2. 7.3.2 EMIRR
      3. 7.3.3 EMIRR Definition
        1. 7.3.3.1 Coupling an RF Signal to the IN+ Pin
        2. 7.3.3.2 Cell Phone Call
    4. 7.4 Device Functional Modes
      1. 7.4.1 Output Characteristics
      2. 7.4.2 CMRR Measurement
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Related Links
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.3 EMIRR Definition

To identify EMI-hardened operational amplifiers, a parameter is needed that quantitatively describes the EMI performance of operational amplifiers. A quantitative measure enables the comparison and the ranking of operational amplifiers on their EMI robustness. Therefore the EMI Rejection Ratio (EMIRR) is introduced. This parameter describes the resulting input-referred offset voltage shift of an operational amplifier as a result of an applied RF carrier (interference) with a certain frequency and level. The definition of EMIRR is given by Equation 1:

Equation 1. LMV831 LMV832 LMV834 30024166.gif

where

  • VRF_PEAK is the amplitude of the applied un-modulated RF signal (V)
  • ΔVOS is the resulting input-referred offset voltage shift (V)

The offset voltage depends quadratically on the applied RF level, and therefore, the RF level at which the EMIRR is determined should be specified. The standard level for the RF signal is 100 mVP. AN-1698 (SNOA497) addresses the conversion of an EMIRR measured for an other signal level than 100 mVP. The interpretation of the EMIRR parameter is straightforward. When two operational amplifiers have an EMIRR which differ by 20 dB, the resulting error signals when used in identical configurations, differ by 20 dB as well. So, the higher the EMIRR, the more robust the operational amplifier.